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<p><dfn class="terminology">Theorem</dfn> If <span class="process-math">\(Y_1(x)\)</span> and <span class="process-math">\(Y_2(x)\)</span> are two solutions of (<a href="" class="xref" data-knowl="./knowl/eq3_11.html" title="Equation 3.6.1">(3.6.1)</a>), then <span class="process-math">\(Y_2(x)-Y_1(x)\)</span> is a solution of (<a href="" class="xref" data-knowl="./knowl/eq3_12.html" title="Equation 3.6.2">(3.6.2)</a>).</p>
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